Targeted Messaging App!

I have this idea for a personalized messaging app. It's called "Select". <br><br>The goal is that you can choose who can message you. And who can't. <br><br>It's an app where you can send a friend request to someone. Then they can accept you or reject you. Then you'll have a new chat with that person.<br><br>But the twist is, if someone tries to message you on the app without you accepting a friend request from them, they will get a message saying that you are not accepting messages from anyone at the moment!<br><br>The twist is that even if you block someone on the app, they'll get the same message. <br><br>So they won't know whether you've blocked them, or you're just not accepting messages from anyone.<br><br>Just thought it was quite a fun idea. <br><br>Thanks!